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Spine question

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BowEd:
DC...Seems everyone has their limits but if an arrow is within 5#'s of a difference in spine from 1 side to the other I call it good enough.The arrow will fly good enough for me.Of course balanced is best.If it is 10#'s difference I've taken it off the compression side to balance them a little better.
It has to be done right away as the shaft is a bit too heavy as if it is done later towards the finish the shaft will get too weak.

DC:
Thanks guys. This was just an experiment to see if it would fly any better. What it did do was sort out in my mind what PatB means when he says stiff side to the bow. I never knew for sure what that meant. I'm pretty sure now that it means that the arrow is weakest in the direction that it has to bend to get around the bow.

DC:
I would like to talk about this a bit more. :D Initially I was surprised that an arrow could be stiffer one way. I expected that if you bent it, measured the deflection and then rotated it 180 degrees, it would be the same deflection. Nope. Then I had to decide which side to scrape to equalise it. I guessed it would be the tension side. I took a few scrapes and measured it. It seemed to be getting worse but rather than ruin an arrow I started this post. Ed says he scrapes the compression side. That seems to fall in line with what I've seen. I'll try that after I finish my coffee. Pat, do you know what side Art scraped? Do we have any theories why it's that way?

willie:
If I place the point of an arrow on a smooth table top, holding the nock end with one hand while pressing a bend into the shaft with the other hand ... and roll the arrow back and forth, I can easily find the stiffside and the weak side.

I scrape the up-facing side when the arrow is the stiffest. I could be doing it different from everybody else however.

Often it seems like the arrow is only stiff on one quadrant, and weak on the three other sides.

I only need to scrape for stiffness in the middle third of the arrow for spine, and as  jeffp51 mentioned in the other thread, reduce the outer thirds for weight reduction

DC:
So you're scraping the compression side when the arrow is stiffest, Can you remember why you chose to scrape that side?

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